Under Armour Armourvent Compression Running Shorts Compression - This ultra-tight, second-skin fit delivers a locked-in feel that keeps your muscles fresh and your recovery time fast. Iso-Chill Fabric - Helps to disperse body heat, making it feel cool to the touch. ArmourVent Mesh Panels - Deliver true breathability in a light, stretchy, durable, fast-drying fabric. 4-Way Stretch Fabrication - Allows greater mobility and maintains shape. Moisture Transport System - Wicks sweat away from the body.